The CP4 fuel pump Silverado Sierra lawsuit was a class action against General Motors over Bosch CP4 fuel pumps in 2011 to 2016 Duramax diesel trucks. It ended in a settlement valued at $50 million, and Judge Terrence G. Berg gave final approval on May 6, 2025.
- Quick Facts About the CP4 Fuel Pump Silverado Sierra Lawsuit
- What the Lawsuit Claimed About the CP4 Pump
- Case Timeline From 2019 to 2026
- What the Court Decided Before the Settlement
- Where the $50 Million Settlement Went
- Who Qualified: Trucks, States and Dates
- Deadlines and Payment Status Today
- How Much Did Owners Get?
- Proof Owners Needed
- CP4 Fuel Pump Silverado Sierra Lawsuit: Options If You Missed Out
- Ford and Ram CP4 Cases Are Different
- Warning Signs of CP4 Trouble
- Common Mistakes Owners Make
- How We Checked This Article
- FAQ
- What is the CP4 fuel pump Silverado Sierra lawsuit?
- Is the GM CP4 settlement still open?
- How much was the GM fuel pump settlement?
- Which Silverado and Sierra trucks were covered?
- How much money did owners receive?
- When were the checks mailed?
- Does the GM settlement cover Ford or Ram trucks?
- What can I do if my CP4 pump fails now?
- Conclusion
GM denied any wrongdoing.
Can you still file a claim? Not in this settlement, because the repair and former owner claim deadline passed on November 6, 2025. The 50 percent repair refund program also ended in 2026.
That does not leave every owner without options. Ford and Ram owners have separate CP4 cases, and the Ford case had a big ruling just weeks ago.
Quick Facts About the CP4 Fuel Pump Silverado Sierra Lawsuit
| Detail | What the Records Show |
|---|---|
| Case name | Chapman et al. v. General Motors LLC |
| Court and number | U.S. District Court, Eastern District of Michigan, No. 2:19-cv-12333 |
| Judge | Terrence G. Berg |
| Trucks | 2011 to 2016 Chevrolet Silverado and GMC Sierra with the 6.6L Duramax diesel and Bosch CP4 pump |
| Covered purchases | GM dealer sales in 7 states, March 1, 2010 to September 13, 2024 |
| Settlement value | $50 million, including $15 million for attorneys’ fees and costs |
| Final approval | May 6, 2025 |
| Claim deadline | November 6, 2025 (closed) |
| First payments mailed | March 23, 2026 |
| Class counsel | Hagens Berman, Hilliard Law, and The Miller Law Firm |
What the Lawsuit Claimed About the CP4 Pump
The plaintiffs said GM put a Bosch CP4 high-pressure fuel pump in its Duramax diesels even though the pump was fragile. They said the pump depends on diesel fuel for lubrication, and U.S. diesel is drier than diesel in other markets because of emissions rules.
According to the court’s class certification opinion, the owners alleged that this can create metal debris. They said the debris can spread through the fuel system and cause sudden stalling or power loss. They also said GM knew about the problem before production and did not disclose it at the point of sale.
Plaintiffs’ lawyers have put repair bills at $8,000 to $20,000. A law firm guide on the case reports owners with bills above $15,000. Those are allegations and owner reports, not court findings.
GM denied wrongdoing and settled to avoid more litigation. No court ever ruled that the pump was defective.
Case Timeline From 2019 to 2026
| Date | Event |
|---|---|
| December 2, 2019 | Class action filed against GM, per plaintiffs’ counsel |
| April 1, 2021 | Judge Berg lets most claims proceed, per Hagens Berman |
| March 31, 2023 | Seven state classes certified |
| October 2024 | News reports announce a settlement with $35 million for owners |
| December 12, 2024 | Opt-out and objection deadline |
| April 25, 2025 | Fairness hearing |
| May 6, 2025 | Final approval, case dismissed with prejudice |
| November 6, 2025 | Deadline for repair and former owner claims |
| March 23, 2026 | First payments mailed |
| May 6, 2026 | 50 percent refund program ends |
| July 5, 2026 | Last day to send refund requests |
What the Court Decided Before the Settlement
Judge Berg did not rule on whether the pump was defective. He did rule on whether the case could go forward as a class action.
On March 31, 2023, he certified seven classes. They covered purchasers from GM dealers in California, Florida, Illinois, Iowa, New York, Pennsylvania, and Texas. He denied a multistate class without prejudice, and he rejected Alabama and Michigan classes on unjust enrichment grounds.
Two points from that opinion matter for owners. First, owners whose trucks had not yet failed still had standing because they claimed they overpaid for the truck. Second, the court found common questions, such as what GM knew, could be answered for the whole group.
Our Google Android cellular data lawsuit guide covers another large class action that ended in verdicts and settlements.
Where the $50 Million Settlement Went
You will see both $35 million and $50 million online. Both numbers are correct, and they measure different things. The official GM fuel pump settlement FAQ says class counsel’s request for up to $15 million is separate from the $35 million for class members, and the court approved it.
| Piece | Amount | Who it helped |
|---|---|---|
| Repair Fund | $30 million | Owners who paid out of pocket for a non-warranty CP4 repair |
| Former Owner Fund | $5 million | Former owners who did not pay for a CP4 repair |
| Attorneys’ fees and costs | Up to $15 million | Class counsel |
| Service awards | 11 awards of $5,000 | Class representatives, paid separately |
| 50 percent repair refunds | No stated cap | Owners with repairs at GM dealers after May 6, 2025 |
Add $30 million, $5 million, and $15 million, and you reach $50 million. A Hagens Berman summary of the final approval also describes the settlement as valued at $50 million.
One third party listing says the $35 million also covers fees. That conflicts with the official FAQ, so rely on the FAQ.
Who Qualified: Trucks, States and Dates
The official site says Class Trucks are model year 2011 to 2016 Chevrolet Silverado or GMC Sierra diesel trucks with 6.6L Duramax engines and Bosch CP4 pumps. The truck had to be bought from a GM-authorized dealer in one of seven states between March 1, 2010 and September 13, 2024.
Those states were California, Florida, Illinois, Iowa, New York, Pennsylvania, and Texas. Hagens Berman lists the engine codes as LML for 2011 to 2016 and LGH for 2011 to 2012.
Hypothetical example: A shopper in Texas bought a 2014 Silverado 2500HD from a Chevrolet dealer in 2016. That truck fits the pattern. A second shopper in Ohio bought a 2014 Silverado from a private seller. That truck does not, because the purchase was outside the seven states and not from a GM dealer.
Watch for errors online. One consumer article gave the start of the purchase window as March 1, 2020, and the official site says 2010. Another guide lists Tahoe, Suburban, and Yukon models, which the official FAQ does not.
The class used a VIN lookup tool on the settlement site. If your truck is a close call, check the VIN before you decide.
Deadlines and Payment Status Today
For this settlement, every filing deadline has passed.
- Repair Fund and Former Owner claims: November 6, 2025
- Opt out of the class: December 12, 2024
- Refund request forms: 60 days after the repair, with a final date of July 5, 2026
- 50 percent refund program: ended May 6, 2026, or at 200,000 miles
The first payments were mailed on March 23, 2026, according to the official site. It says payments for claims that were fixed after a deficiency notice go out on a rolling basis, and approved refund requests are paid within 60 days.
One outlet reported a second round on August 31, 2026. The official FAQ does not give that date, so treat it as unconfirmed. One report lists payment choices of virtual debit card, PayPal, Venmo, or paper check, with check as the default.
If you filed a valid claim and have no payment, contact JND Legal Administration at 1-866-848-0815 or info@GMFuelPumpLitigation.com. The FAQ tells people not to call the court or GM about the notice.
How Much Did Owners Get?
Nobody knows the final per person amount yet, because the administrator has not published it. The claim materials gave estimates before the claims count was known.
- Repair Fund: about $6,356 to $12,712 per payment
- Former Owner Fund: about $400 to $800 per payment
Those ranges moved with the number of valid claims. The pre-claim estimates counted on about 9,400 qualifying repairs, per one summary. If more people filed, each share shrank.
Payouts often differ from the headline number. For another example of a claims process, see our Cash App spam text lawsuit settlement payout guide.
Proof Owners Needed
The official FAQ asked for three kinds of proof. The rules were strict, and weak records were a common reason claims needed fixing.
- Purchase proof: A purchase or financing agreement showing your name and the dealer’s name and address.
- Out of pocket repair: A repair order or invoice with your name, the VIN, and the covered parts. If you had no invoice, a bank or credit card statement plus a signed declaration.
- Former owner proof: Proof of sale showing the date, your name, the VIN, and the buyer’s name.
For any future claim, keep every repair order, receipt, and sales document, and store copies in the cloud.
CP4 Fuel Pump Silverado Sierra Lawsuit: Options If You Missed Out
This section is general information, not advice for your situation. Rights depend on your state, your purchase, and your paperwork.
First, know where you stand. People who did not opt out by December 12, 2024 are generally treated as bound by the class release, even if they never filed a claim. The Hagens Berman summary says the settlement releases class members’ claims.
If you were never in the class, other paths may exist. Many owners look at the following.
- Written warranty coverage. Check your original warranty terms and any extended coverage. The renewed 50 percent program is over, so ask a GM dealer what coverage applies now.
- Implied warranty and lemon law. State rules differ, and time limits can be short. One law firm blog says Arizona’s lemon law is unlikely to help with a 2011 to 2016 truck because of its time limits.
- Federal warranty law. The Magnuson-Moss Warranty Act is a 1975 law on consumer product warranties. The FTC’s page on its warranty rules explains disclosure and dispute rules at a high level.
- Used truck buyer protections. Certified pre-owned programs have their own terms. Our Kim Muratori Mercedes-Benz lawsuit guide includes a CPO buyer guide.
- Service contracts. Some contracts exclude fuel system parts. Our CarGuard lawsuit explainer covers cases against a vehicle coverage seller.
- Report the problem. NHTSA says to report any issue you think could be a safety defect, by its online form or the Vehicle Safety Hotline at 888-327-4236. Its consumer alert on reporting safety issues says many recalls begin as public complaints.
Our attorney vs lawyer guide explains the terms in plain English. A consumer or product defect attorney in your state can review your records.
Ford and Ram CP4 Cases Are Different
Many searchers mix the GM case with the Ford and Ram cases. Do not assume a GM settlement helps a Ford or Ram owner.
| Case | Court and Number | Status Reported |
|---|---|---|
| GM Duramax, Chapman | E.D. Mich., 2:19-cv-12333 | Settled, final approval May 6, 2025 |
| Ford 6.7L Power Stroke, Droesser | E.D. Mich., 2:19-cv-12365 | Five state classes certified September 30, 2026, no settlement reported |
| Ram, Cummins and FCA | E.D. Mich., 2:21-cv-12497 | Active, no settlement reported |
In the Ford case, Judge Laurie J. Michelson certified classes in California, Louisiana, Ohio, Pennsylvania, and South Carolina. Class members must have paid out of pocket for a CP4 repair and must not have signed a dealer arbitration agreement, according to counsel coverage.
Ford disputes the claims and argues failures can come from poor maintenance or contaminated fuel.
Autoblog’s report on the Ford class action says no trial date is confirmed and puts repair costs above $9,000. One site reports that Ford asked the Sixth Circuit on October 14 for permission to appeal, which we could not confirm from a court source. Hagens Berman’s Ram page says no Ram settlement is reported.
Engine disputes in other trucks follow their own rules too. Our report on the Ford F-150 oil consumption lawsuit covers a separate Ford truck engine case.
Warning Signs of CP4 Trouble
Law firm guides list these common signs of a failing pump. They are clues, not a diagnosis.
- Longer cranking before the engine starts
- A check engine light with a fuel pressure code
- A new tick or rattle near the pump
- Less power when towing or climbing
- Sudden stalling that will not restart
- Fine metal flakes in the fuel filter
If you see metal in the filter, one guide says to stop driving the truck. A qualified diesel technician can confirm the cause and give you a written repair order.
Common Mistakes Owners Make
- Throwing away paperwork. Repair orders and receipts decided many claims.
- Waiting for a settlement email. Deadlines pass whether or not you read the notice.
- Assuming one truck brand covers another. A Ford or Ram owner is not part of the GM class.
- Skipping the VIN check. Model year, engine, and dealer location all mattered.
- Ignoring early symptoms. Running a failing pump can spread debris and raise the bill.
How We Checked This Article
We reviewed the official settlement FAQ, the court’s 2023 certification opinion, Hagens Berman case pages, NHTSA and FTC pages, and news coverage of the settlement and the 2026 Ford ruling. Where outlets disagreed, we used the official site or the court opinion.
We could not open the live court docket, and two of the three competitor pages did not load for us. For that reason, the final approval date comes from Hagens Berman and an industry summary, not the order itself. The August 31 payment date and the Sixth Circuit petition each come from a single report, so we label them unconfirmed.
FAQ
What is the CP4 fuel pump Silverado Sierra lawsuit?
It is a class action, Chapman v. General Motors LLC, over Bosch CP4 fuel pumps in 2011 to 2016 Silverado and Sierra Duramax diesel trucks. It settled for a value of $50 million, and GM denied wrongdoing.
Is the GM CP4 settlement still open?
No. The claim deadline was November 6, 2025, and the refund request period ended July 5, 2026. Payments are still being handled by the administrator for approved claims.
How much was the GM fuel pump settlement?
It was valued at $50 million. That includes $30 million for repairs, $5 million for former owners, and up to $15 million for attorneys’ fees and costs.
Which Silverado and Sierra trucks were covered?
Model year 2011 to 2016 trucks with the 6.6L Duramax diesel and Bosch CP4 pump. They had to be bought from a GM-authorized dealer in California, Florida, Illinois, Iowa, New York, Pennsylvania, or Texas between March 1, 2010 and September 13, 2024.
How much money did owners receive?
Early estimates were about $6,356 to $12,712 for owners who paid for repairs and about $400 to $800 for former owners. The administrator has not published actual amounts, so your payment may differ.
When were the checks mailed?
The official site says the first payments went out March 23, 2026. Later payments are issued on a rolling basis for claims that were corrected after notice.
Does the GM settlement cover Ford or Ram trucks?
No. Ford and Ram CP4 cases are separate. A federal judge certified five state classes in the Ford case on September 30, 2026, and no Ford or Ram settlement is reported.
What can I do if my CP4 pump fails now?
Check your warranty, keep every repair record, and report a possible safety defect to NHTSA. A licensed attorney in your state can explain whether any other claim fits your facts.
Conclusion
The CP4 fuel pump Silverado Sierra lawsuit reached a $50 million settlement, and the filing windows for it have closed. If you filed a valid claim, your next step is to contact the administrator about payment. If you missed it, your options depend on your state, your records, and your truck.
The bigger picture keeps moving. Ford owners just won class status in five states, and the Ram case is still active. Keep your repair orders, check your VIN, and talk with a qualified attorney licensed in your state before you act.
